/Engine/Plugins/Developer/Concert/ConcertMain/Source/ConcertClient/Public/IConcertClient.h
Join a session on the server, the settings of the sessions needs to be compatible with the client settings or the connection will be refused.
A future that will contains the final response code of the request
[TFuture](API\Runtime\Core\Async\TFuture)< [EConcertResponseCode](API\Plugins\ConcertTransport\EConcertResponseCode) > JoinSession ( const [FGuid](API\Runtime\Core\Misc\FGuid) & ServerAdminEndpointId, const [FGuid](API\Runtime\Core\Misc\FGuid) & SessionId )